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Tool Talk Discussion Forum

20 HP Briggs LOPING

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Dan in Ore

07-01-2006 09:14:38




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My neighbor has a lawn tractor that is loping or hunting. I think it is probably lack of fuel. The flow from the tank seems to be adequate. Any suggestions?

Dan




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Dan in Ore

07-04-2006 05:09:37




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
Went over there yesterday and started it up, pulled the choke out a little bit and it smoothed right out.

I took off all the cowling and took the plate off the top of the carb. I sprayed out all of the channels and orifices with carb cleaner. Put it back together and it ran like it shoulda.

It turned out to be a 21.5HP. Thanks for all the help and advice.

Dan



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oldrustycars

07-03-2006 15:53:47




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
there should be a spring that connects the governor arm and the throttle arm. it goes over the throttle rod, and keeps any slop or slack out of the throttle. without it, the throttle will "hunt", or surge. a simple fix.



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msb

07-01-2006 21:21:28




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
Check the governor linkage.It should be about a hole short of slip fit.



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addendum

07-01-2006 21:22:52




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 Re: 20 HP Briggs LOPING in reply to msb, 07-01-2006 21:21:28  
With both carb and governor in the wide open position.



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Leland

07-01-2006 15:56:46




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
Try pouring a 1/2 a can of seafoam in it first them run it this clears up a lot of problems sometimes .



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Mark - IN.

07-01-2006 13:57:37




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
Maybe using reformulated low polution gasoline? That stuff sure dirties up a small engine carb. I"d try the clean the carb thing first. I rent a small place in Illinois where I work during the week, and go home to rural Indiana on weekends. Holy cow the gas in more densily populated areas (Will County, IL.) was making that mower run like crap, and everytime I"d clean it, it"d run great for a few mows, then crappy again. Then someone mentioned the reformulated low pollution gasoline, so I cleaned the carb again and started bringing gasoline from back home...not a problem since. Just a thought.

Mark

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Mark - IN.

07-02-2006 06:20:05




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 Re: 20 HP Briggs LOPING in reply to Mark - IN., 07-01-2006 13:57:37  
I heard it from the Home Depot guy in Joliet. I was in there buying something and noticed the little Deere riders, and commented about Deere products being sold in a Home Depot...where I come from its the Deere guy's dealership. We got to talking and he pointed out that mowers were selling faster than hotcakes and he laughed it off, describing the buyers as having the same problems as me...then pointed out that it was caused by the reformulated low pollution gasoline. I'd never thought about that until he said that. He was laughing all the way to the bank for Home Depot, and I'd been grumbling about having to clean the carb every few mows. Now I just bring it from home.

McHenry County? That's pretty rural. I'm surprised have reformulated that far out. But then again, I guess that stuff's gonna end up everywhere if for no other reason, to cut down on the refineries having to supply 8 million different blends to comply with the EPA laws and standards for different areas.

Mark

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don t.-9n180179

07-02-2006 05:02:43




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 Hey Mark - IN..... in reply to Mark - IN., 07-01-2006 13:57:37  
I live in McHenry county, noticed the same as you with Illinois summer gas. I've been running the 93 octane w/o problems in my small engines. Might get you by in a pinch.
HTH.....don t. ....



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Pete in MD

07-01-2006 12:36:02




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
I have a 9 year old twin cylinder 20 horse Briggs that did the same thing awhile back. Giving it some choke made the lope go away so I rebuilt the vacumm operated diaphragm fuel pump. End of problem.



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jeffcat

07-01-2006 10:58:54




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
Yup--- dirt or air adjustment or fuel adjustment or filter. Also on the older ones there is a little spring that takes up the slop in the linkage. If this is broken it will never run smooth. Need a little more info. Jeffcat



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Bus Driver

07-01-2006 09:58:33




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
If it has a fuel filter in the line, replace that as a first step.



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BobMo

07-01-2006 09:47:55




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
Old may very well be correct but I suspect this is an older Briggs and the carburetor adjustment is at the front. As these get older the adjustment screw doesn't hold well and may need to be adjusted frequently..... ..
There are also other possible causes such as, a dirty intake filter. Probably has 2 stage and both should be clean....



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old

07-01-2006 10:07:57




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 Re: 20 HP Briggs LOPING in reply to BobMo, 07-01-2006 09:47:55  
Bob, as you know, since he didn't say how new or old this engine is I could onlu guess but your right on track also. There are times that it would be nice if people would give more info so we could help them better. Even knowing what brand of mower its on would help a lot. I just guessed that it was a newer one because of the size of the engine since they didn't make many 20HP engine 20 years ago LOL

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old

07-01-2006 09:27:19




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 Re: 20 HP Briggs LOPING in reply to Dan in Ore, 07-01-2006 09:14:38  
On most engines when they do that its a problem with the carb, its either in need of a rebuild or it just plain isn't set right. Problem is on these newer carbs they don't have an adjustment so the only way to fix them is to open them up and clean them out.



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Gene Davis (Ga.)

07-02-2006 19:55:43




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 Re: 20 HP Briggs LOPING in reply to old, 07-01-2006 09:27:19  
One thing you need to watch for is the fact that Briggs supplies at least 2 different kits. One is for fuel pump type carburetor and the other is for a gravity fed carb. The jets and inlet needle/seat assembly are different sizes.



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